Pressure-sensitive adhesive sheet and pressure-sensitive adhesive functional film

Abstract

The present invention provides a pressure-sensitive adhesive sheet including at least one pressure-sensitive adhesive layer formed of a pressure-sensitive adhesive composition containing an acrylic polymer (a) in which the total content of acrylic acid and methacrylic acid relative to the entire monomer ingredients constituting the acrylic polymer is 10% by weight or less, in which the total amount of an acrylic acid ion and a methacrylic acid ion extracted from the pressure-sensitive adhesive sheet with pure water under the condition of 100 DEG C. for 45 minutes, as measured in accordance with an ion chromatography, is 20ng / cm2 or less per the unit area of the pressure-sensitive adhesive layer.

Description

technical field The present invention relates to pressure-sensitive adhesive sheets. Precisely, the present invention relates to a pressure-sensitive adhesive sheet that does not cause corrosion of a metal thin film or a metal oxide thin film and is advantageous for sticking to a metal thin film or a metal oxide thin film. Background technique Recently, a display device such as a liquid crystal display (LCD) and an input device such as a touch panel to be combined with the display device have been widely used in various fields. In the manufacture of such display devices and input devices, transparent pressure-sensitive adhesive sheets are used for bonding parts (optical parts) such as transparent plastic substrates (such as polycarbonate substrates, acrylic resin substrates) and optical components of polarizers. film etc. In these applications, the pressure-sensitive adhesive sheet is required to be transparent and is also required to have excellent reliability such as res...

AI Technical Summary

Problems solved by technology

However, in the case where the above pressure-sensitive adhesive sheet comprising an acrylic polymer or the like composed of a carboxyl group-containing monomer as a monomer component is stuck to a metal film and when it is stored under high-humidity conditions, a problem arises The resistance value of the metal film changes, that is, the metal film is corroded

Therefore, at present, no one has succeeded in obtaining a pressure-sensitive adhesive sheet satisfying the corrosion resistance of a metal film (hereinafter This may be referred to simply as "corrosion resistance")

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